Polish SizeAndTimeBasedRollingPolicy changes

Closes gh-6352

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1624,11 +1624,13 @@ To help with the customization, some other properties are transferred from the S
 
 |`logging.file.max-size`
 |`LOG_FILE_MAX_SIZE`
-|Maximum log file size (if LOG_FILE enabled). (Only supported with the default logback setup.)
+|Maximum log file size (if LOG_FILE enabled). (Only supported with the default logback
+ setup.)
 
 |`logging.file.max-history`
 |`LOG_FILE_MAX_HISTORY`
-|Maximum number of archive log files to keep (if LOG_FILE enabled). (Only supported with the default logback setup.)
+|Maximum number of archive log files to keep (if LOG_FILE enabled). (Only supported with
+ the default logback setup.)
 
 |`logging.path`
 |`LOG_PATH`
@@ -1655,7 +1657,6 @@ To help with the customization, some other properties are transferred from the S
  environment variable).
 |===
 
-
 All the supported logging systems can consult System properties when parsing their
 configuration files.  See the default configurations in `spring-boot.jar` for examples:
 

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java

@@ -149,11 +149,20 @@ class DefaultLogbackConfiguration {
 
 	private void setRollingPolicy(RollingFileAppender<ILoggingEvent> appender,
 			LogbackConfigurator config, String logFile) {
-		SizeAndTimeBasedRollingPolicy<ILoggingEvent> rollingPolicy =
-				new SizeAndTimeBasedRollingPolicy<>();
+		SizeAndTimeBasedRollingPolicy<ILoggingEvent> rollingPolicy = new SizeAndTimeBasedRollingPolicy<>();
 		rollingPolicy.setFileNamePattern(logFile + ".%d{yyyy-MM-dd}.%i.gz");
-		String maxFileSize = this.patterns.getProperty("logging.file.max-size",
-				MAX_FILE_SIZE);
+		setMaxFileSize(rollingPolicy,
+				this.patterns.getProperty("logging.file.max-size", MAX_FILE_SIZE));
+		rollingPolicy.setMaxHistory(this.patterns.getProperty("logging.file.max-history",
+				Integer.class, CoreConstants.UNBOUND_HISTORY));
+		appender.setRollingPolicy(rollingPolicy);
+		rollingPolicy.setParent(appender);
+		config.start(rollingPolicy);
+	}
+
+	private void setMaxFileSize(
+			SizeAndTimeBasedRollingPolicy<ILoggingEvent> rollingPolicy,
+			String maxFileSize) {
 		try {
 			rollingPolicy.setMaxFileSize(FileSize.valueOf(maxFileSize));
 		}
@@ -163,12 +172,6 @@ class DefaultLogbackConfiguration {
 					SizeAndTimeBasedRollingPolicy.class, "setMaxFileSize", String.class);
 			ReflectionUtils.invokeMethod(method, rollingPolicy, maxFileSize);
 		}
-		int maxHistory = this.patterns.getProperty("logging.file.max-history",
-				Integer.class, CoreConstants.UNBOUND_HISTORY);
-		rollingPolicy.setMaxHistory(maxHistory);
-		appender.setRollingPolicy(rollingPolicy);
-		rollingPolicy.setParent(appender);
-		config.start(rollingPolicy);
 	}
 
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java

@@ -128,8 +128,8 @@ public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 		assertThat(getLineWithText(file, "Hello world")).contains("INFO");
 		assertThat(ReflectionTestUtils.getField(getRollingPolicy(), "maxFileSize")
 				.toString()).isEqualTo("10 MB");
-		assertThat(getRollingPolicy().getMaxHistory()).isEqualTo(
-				CoreConstants.UNBOUND_HISTORY);
+		assertThat(getRollingPolicy().getMaxHistory())
+				.isEqualTo(CoreConstants.UNBOUND_HISTORY);
 	}
 
 	@Test
@@ -350,8 +350,8 @@ public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 	public void testMaxFileSizeProperty() throws Exception {
 		MockEnvironment environment = new MockEnvironment();
 		environment.setProperty("logging.file.max-size", "100MB");
-		LoggingInitializationContext loggingInitializationContext =
-				new LoggingInitializationContext(environment);
+		LoggingInitializationContext loggingInitializationContext = new LoggingInitializationContext(
+				environment);
 		File file = new File(tmpDir(), "logback-test.log");
 		LogFile logFile = getLogFile(file.getPath(), null);
 		this.loggingSystem.initialize(loggingInitializationContext, null, logFile);
@@ -365,8 +365,8 @@ public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 	public void testMaxHistoryProperty() throws Exception {
 		MockEnvironment environment = new MockEnvironment();
 		environment.setProperty("logging.file.max-history", "30");
-		LoggingInitializationContext loggingInitializationContext =
-				new LoggingInitializationContext(environment);
+		LoggingInitializationContext loggingInitializationContext = new LoggingInitializationContext(
+				environment);
 		File file = new File(tmpDir(), "logback-test.log");
 		LogFile logFile = getLogFile(file.getPath(), null);
 		this.loggingSystem.initialize(loggingInitializationContext, null, logFile);